How does the theory of endosymbiosis account for the evolution of eukaryotes

The endosymbiotic theory explains how eukaryotic cells evolved. The large and small cells formed a symbiotic relationship in which both cells benefited. Some of the small cells were able to break down the large cell's wastes for energy. ... They became the chloroplasts of eukaryotic cells.Explanation:

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answer; i believe the correct answer is (replication is not conservative);